Clatter at 3000rpm

[floatingjimi]

Collected my 500 today and had a great drive accross country.
One issue -(not bad really) under acceleration - there is a clatter - about 3000rpm - only under load - not gentle acceleration - any ideas, thoughts were baffles in the cat - lifters? Running very well - covered 280 miles and no loss of power etc.

[Simon.b]

It could be just pinking as a result of not being full of Shell’s finest V Power. They are supposed to run on 98 Octane according to the handbook.

I don’t know why but some do it more than others, I’m lucky and mine runs OK on premium, but is noticeably better on the higher octane stuff.

Back off a bit till you empty the tank and it should be OK.

[floatingjimi]

The chap I bought it from had been running it on 95 for 16 years!! will see once I get through the tank - thanks

[floatingjimi]

He also had the mix "adjusted" earlier in the year as it was not running right on idle.

[Rob_the_Sparky]

If it is pinking then it will occur worst at high load (full throttle) and low revs. I don't know how senstive the Griff is to 95 fuel but it certainly isn't ideal. If ignition timing has been adjusted to reduce pinking (not sure if you can on the Griff...someone else confirm?) then it will need to be re-tuned once you have put a tank or two of the good stuff through it to get the best out of the engine.

Rob

[paulathome]

It might be worth checking your exhaust manifold gaskets for leaks round
Where they join the head. If they are leakng they can sound like a noisy tappet.
As it does it under acceleration i would make them the prime suspect.
Paul

[floatingjimi]

Thanks, for all of the advice, have put some octane booster in for the moment, and once it is empty will put in the good stuff, before I run it over to Dom at TVR Power next week.

[floatingjimi]

had a good run with the octane booster this afternoon - all good- thansk again